To work around your problem, I would recommend you use the
SecondaryTile.Exists method to instead. Add the SecondaryTile.TileID into ApplicationData.Current.LocalSettings.values object after you create a new SecondaryTile object. When you want to check if the tile is exists next time, retire the TileID from LocalSettings,
pass it into SecondaryTile.Exists method. Code would like the following.

If you still have questions, please post more information about your scenario.

Regards,

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